Rotary head with sealing strips

Abstract

An application head ( 11 ) for the contact-free application of liquid media such as liquefied thermoplastic plastics or melted hot-melt adhesives to a length of material ( 22 ) which is movable relative to the application head. The head includes a housing ( 12 ), a cylinder chamber ( 20 ) which is provided in the housing and in which a cylinder slide ( 13 ) is supported so as to be rotatingly driveable, and a nozzle device ( 18 ) for discharging liquid medium. The nozzle device ( 18 ) is controllable by the cylinder slide ( 13 ) and extends transversely to the direction of movement of the length of material. The cylinder slide ( 13 ), in its cylindrical surface, includes first surface grooves ( 27 ) which are supplied with liquid medium and which, as a function of the rotational position, are able to communicate with the nozzle device ( 18 ). The cylinder slide ( 13 ), in its cylindrical surface, also includes second surface grooves ( 31 ) which accommodate sealing strips ( 32 ) which, with pre-pressure, rest against the surface of the cylinder chamber ( 20 ).

1. An application head ( 11 ) for applying liquid media to a length of material ( 22 ) which is movable relative to the application head, the application head comprising a housing ( 12 ) having a cylinder chamber ( 20 ), a cylinder slide ( 13 ) rotatably driveably supported in the cylinder chamber ( 20 ), and a nozzle ( 18 ) for discharging the liquid medium, the nozzle being controllable by the cylinder slide ( 13 ) and extending transversely to the direction of movement of the length of material, wherein the cylinder slide ( 13 ) comprises:
 an inner chamber ( 29 ) adapted to be supplied with liquid medium;  
 a cylindrical surface ( 35 );  
 a first surface groove ( 27 ) in the cylindrical surface, which can be supplied with liquid medium and which, as a function of the rotational position of the cylinder slide, can communicate with the nozzle ( 18 );  
 first radial bores ( 28 ) extending from the inner chamber ( 29 ) to the first surface groove ( 27 ); and  
 a second surface groove ( 31 ) in the cylindrical surface, which accommodates a sealing strip ( 33 ) which is biased toward the surface of the cylinder chamber ( 20 ), wherein the second surface groove ( 31 ) is associated with the first surface groove ( 27 ) in such a way that, upon rotation of the cylinder slide the second surface groove ( 13 ), follows the first surface groove ( 27 ).  
 
   
   
     2. An application head according to  claim 1 , comprising a plurality of corresponding first and second surface grooves ( 27 ,  31 ), wherein the second surface grooves ( 31 ) and the associated sealing strips ( 33 ) substantially cover the entire cylindrical surface ( 35 ) between each two first surface grooves ( 27 ). 
   
   
     3. An application head according to  claim 1 , wherein the first and second surface grooves ( 27 ,  31 ) are provided in the form of axis-parallel grooves. 
   
   
     4. An application head according to  claim 1  wherein the first surface groove ( 227 ,  327 ) forms a closed shape in the cylindrical surface  9235 ). 
   
   
     5. An application head according to  claim 1  comprising second radial bores ( 32 ) extending from the inner chamber ( 29 ) to the second surface groove ( 31 ). 
   
   
     6. An application head according to  claim 1  wherein the first radial bores ( 28 ) vary in diameter along a length of the cylinder slider ( 13 ). 
   
   
     7. An application head according to  claim 5  wherein the number of first radial bores ( 28 ) is greater than the number of second radial bores ( 32 ). 
   
   
     8. An application head according to  claim 1  wherein the sealing strip ( 33 ) is a segmented or multi-part sealing strip. 
   
   
     9. An application head according to  claim 1 , comprising a sleeve ( 16 ) in the housing and an annular channel between the cylinder slide ( 13 ) and the cylinder chamber ( 20 ), which annular channel is connected to the sleeve in the housing, and radial supply bores ( 26 ) in the cylinder slide ( 13 ) in the plane of the annular channel, which are connected to the inner chamber ( 29 ) for supplying liquid medium. 
   
   
     10. An application head according to  claim 1  wherein, in the cylinder slide ( 13 ), at least at one end, includes an axial bore ( 40 ) which is connected to the inner chamber ( 29 ) and serves to supply liquid medium. 
   
   
     11. An application head according to  claim 10  wherein the axial bore is provided more particularly in a journal ( 15 ) which axially emerges from the housing. 
   
   
     12. An application head according to  claim 9 , wherein the annular channel is formed by an annular groove in the cylinder chamber surface. 
   
   
     13. An application head according to  claim 9 , wherein the annular channel is formed by a circumferential groove ( 25 ) in the cylinder slide ( 13 ). 
   
   
     14. An application head according to  claim 1 , wherein the nozzle ( 18 ) comprises a slot and a diaphragm ( 44 ) within the slot having a plurality of exit apertures ( 45 ) for liquid medium, wherein each exit apertures ( 45 ) communicates with a corresponding radial supply bore ( 21 ) in the housing ( 11 ), said radial supply bores ( 21 ) starting from the cylinder chamber ( 20 ). 
   
   
     15. An application head ( 11 ) for applying liquid media to a length of material ( 22 ) which is movable relative to the application head, the application head comprising a housing ( 12 ) having a cylinder chamber ( 20 ), a cylinder slide ( 13 ) rotatably driveably supported in the cylinder chamber ( 20 ), and a nozzle ( 18 ) for discharging the liquid medium, the nozzle being controllable by the cylinder slide ( 13 ) and extending transversely to the direction of movement of the length of material, wherein the cylinder slide ( 13 ) comprises:
 an inner chamber ( 29 ) adapted to be supplied with liquid medium;  
 a cylindrical surface ( 35 );  
 first surface groove ( 27 ) in the cylindrical surface, which can be supplied with liquid medium and which, as a function of the rotational position of the cylinder slide, can communicate with the nozzle ( 18 ), each first surface groove including a plurality of first radial bores ( 28 ) extending to the inner chamber ( 29 ); and  
 second surface groove ( 31 ) in the cylindrical surface each holding at least one sealing strip ( 33 ) biased toward the surface of the cylinder chamber ( 20 ), wherein each first surface groove ( 27 ) is associated with at least one second surface groove ( 31 ) in such a way that, upon rotation of the cylinder slide ( 13 ), the at least one second surface groove ( 31 ) follows the first surface groove ( 27 ).  
 
   
   
     16. An application head according to  claim 15  wherein the second surface grooves ( 31 ) and associated sealing strips ( 33 ) substantially cover the entire cylindrical surface ( 35 ) between each two first surface grooves ( 27 ). 
   
   
     17. An application head according to  claim 15  wherein each second surface groove ( 31 ) includes at least one second radial bore ( 32 ) extending to the inner chamber ( 29 ). 
   
   
     18. An application head according to  claim 15  wherein the first radial bores ( 28 ) vary in diameter along a length of the cylinder slide ( 13 ). 
   
   
     19. An application head according to  claim 15  wherein the at least one sealing strip ( 33 ) is biased toward the surface of the cylinder chamber ( 20 ) by a spring. 
   
   
     20. An application head according to  claim 15  comprising a sleeve ( 16 ) in the housing and an annular channel between the cylinder slide ( 13 ) and the cylinder chamber ( 20 ), which annular channel is connected to the sleeve ( 16 ) in the housing, and radial supply bores ( 26 ) in the cylinder slide ( 13 ) in the plane of the annular channel which are connected to the inner chamber ( 29 ) for supplying liquid medium.